Locomotive-firebox



' C. A. SIEGEL. LOCOMOTIVE FIREBOX.

I APPLICATION FILED DEGQ, I9I8- I 1,335,399. I PatentedMaI. 30, 1920.

2 SHEETS-SHEET l- Gran ieze VeZ c.' A. SIEGEL.

LOCOMOTWE rmesox.

APPLICATION FILED DEC. 4, 1918.

1,335,399. Patented Mar. 30, 1920.

2 SHEETS-SHEET 2.

CHESTER A. SIEGEL, OF NEWARK, NEW JERSEY.

LOOOIVZOTIVE FIREBOX.

To all whom it may concern:

Be it known that I, Cnns'rnn A. SIEGEL,

a citizen of the United States,residing at r :41 Roseville avenue,Newark, county of Essex, and. State of New Jersey, have invented certainnew and useful Improvements in Locomotive-Fireboxes, fully described andrepresented in the following specification and the accompanyingdrawings, forming apart of the same. I

1 his invention relates to an improvement in the bridge-wall orso-oalled arch some times employed in thefirebox of a locomotive ortubularboiler to retard the movement of the flaming gases into thetubes,

and to thus retain the heated gases more effectively in contact with thecrown-sheet of the firebox, to promote an increased generation of steamand better circulation of water in the water legs.

In the presentconstruction the-arch may be termed a water-archflas it isconstructed of two metal walls with the water circulated between themand connected to the water-legs of the firebox and to the crown of thesame.

This water-arch is extended from the grate level upwardly and backwardlyso as to lean over the fuel burning upon the grate and thus absorb theheat most effectively therefrom. v

The ends of the arch are in communication with the water-legs, and theinclined top-portion of the arch is connected with the crown of thefirebox by two water-tubes which divide the space over the arch into 7three passages, one at the middle and the others at the sides of thefirebox.

Such connections afford a free entrance for the water to the water-archand the escape of the steam therefrom into the steam-space S of theboiler.

The base of the water-arch extends to the bottom of the water-legs, andas the ends of the water-arch are in open communication with thewater-legs this construction permits and induces a current of the colderwater from the water-legs into the bottom of the arch. The water as itis heated flows upwardly by degrees into the upper part of the boilerabove the crown-sheet. The circulation of water between these points ismost important and advantageous.

The base of the arch is located far enough from the ends of thefire-tubes to form a mixing or combustion-chamber back of the vSpecification of Letters Patent. Patented 1H 3,1 30,1920, App1ieati onfiled December 4, 1918. Serial No. 265,206.

arch in which-the combustionis-developed before the gases enter thetubes. v v

The construction will'be-under'stood by reference to the annexeddrawing, in which Figure 1 is a longitudinal central section of alocomotive firebox and apart of" the attached barrel which'co'ntains thefire-tubes; Fig. 2 isa cross sectionthrough the watertubesin the top ofthe arch on line 22 in Fig. 1 g and Fig. '3 is a plan of the arch andthe combustion-chamber behind the same.

.A designates the water-legs of the firebox,

and B the crown sheet thereof. O -isone of the fuel-doors, and D thebarrel of the boiler through which-the fire-tubesF are extended.

' The level of the grate in the bottom of the'fire-box is indicated bythe dotted line F, and the water-arch Gisexte'nded-rearwardly from-thelowestgpoint of the-waterleg upward over the front end of theagrate, andis curvedrearwardly to lean over "the :rear' end of the grate aboutone-third of the grates length. r

The foot ofthe water-arch is connected'to the sidewvater-legs of'thefirebox-at aconside'rable distance in the :rear of the tubesheet so asto forma combustion-chamber J, and the arch itselfisthus'locatedin thecentral portion of the firebox 'where the heat is the greatest. H

This leaves {a large part of {the {space above the grate uncovered sothat the radiant heat can pass from the fuel directly to thecrown-sheet, and thus heat the water above such sheet most effectively.

The projection of radiant heat from the fuel is the most effectiveresult of the combustion, and the water-arch as just stated is soproportioned that it forms no obstruction between the fuel upon a largeportion of the grate, and the crown-sheet where the steam is mosteffectively generated.

The radiant heat from the forward part of the grate acts directly uponthe water in arch are integral with one another at the I top end G, andare connected at the bottom by a spacing-piece G Two water-tubes Hextend from' the top of the arch to the crown-sheet B, being locatednearer to the sides than to the middle line of the boiler, thus formingthree passages I and I from the rear part of the firebox to thecombustion-chamber J in the front of the same. The water-tubes are inopen connection at the bottom-endswith the water in the water-arch,andat the upper end with the water above the crown-sheet.

The ends of the water-arch are, as shown in 2, in open communicationwith the water in the water-legs A, and the colder water in the boilerin thus constantly flowing downward into the water-arch and upwardlythrough the tubes H, carrying with it any steam generated in the arch.

Such colder water of the boiler is often found in the bottom of thewater-legs, and

owing to the connection of the water-arch with the water-legs at theirlowest point, the cold water at such point flows readily into thewater-arch and rises upwardly therein as it is heated.

The firebox is extended in the front of the grate sufficiently to formthe combustion-chamber J between the water-tubes H, the arch Gr, and theadjacent ends of the fire-tubes E.

I am aware that water connections have been extended between thesidewalls of the firebox but at points considerably above the bottom ofthe water-legs at which point a movement of the water is most desirableto prevent the accumulation of scale. I do not therefore claimawater-arch broadly, but the particular construction and relation of mywater-arch to the water-legs.

Hand-holes having removable covers M are shown at the bottom of thewater-legs in Figs. 1, 2 and 3, to facilitate the cleaning out of thebottom of the arch in case any sediment accumulates therein, and a ventL is provided in the bottom of the combustion-chamber J to remove anyashes or sediment therefrom.

My water-arch is constructed with very few parts, and this attachmentfor locomotive boilers is therefore cheap and durable, and may bereadily applied to such boilers as are already in use. It promotes theproper mixing and combustion of the gases while retaining the operationof the radiant heat upon the crown-sheet.

My invention is thus practicable and efiicient in every respect.

Having thus set forth the nature of the invention what is claimed hereinis:

A locomotive boiler having a firebox with water-legs at opposite sides,a fuel-door at one end and the tube-sheet at the opposite end extendingdownward to the bottoms of the water-legs, a water-arch extending fromthe lowest point of the water 1egs at the front end of the grateupwardly and rear wardly over the front end of the grate and being inopen communication with the water-legs to the bottoms of said legs andproducing a current of water outwardly from the bottoms of thewater-legs, hand-holes and covers at the bottoms of the water-legscommunicating with the lower part of the water-arch for cleaning out thesame, and at least one water-tube extended from the top of thewater-arch to the crown-sheet, whereby the water flows through thewaterarch from the bottoms of the water-legs to the upper water-spaceover the firebox.

In testimony whereof I have hereunto set my hand.

CHESTER A. SIEGEL.

